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请问,ULN2803输入高电平导通,还是低电平导通,若是高电平导通 输入是3.3vTTL电平是否可以的导通,谢谢

请问,ULN2803输入高电平导通,还是低电平导通,若是高电平导通 输入是3.3vTTL电平是否可以的导通,谢谢